* {
    margin: 0;
    padding: 0;
    list-style: none;
}

a {
    color: #000;
    text-decoration: none;
}

.content {
    width: 800px;
    margin: 50px auto;
}

.flex {
    display: flex;
}

.a-c {
    align-items: center;
}

.row-r {
    flex-direction: row-reverse;
}

.col {
    flex-direction: column;
}